File holder for saw filing machines



June 17, 1941. KNOWLES 2,245,983 7 FILE HOLDEILFOR SAW FILING MACHINES Filed June 29, 1939 2 Sheets-Sheet I 9% a J M MS' abto'wm June 17, 1941. F. J. KNOWLES FILE HOLDER FOR SAW FILING MACHINES Filed June '29, 1939 2 Sheets-Sheet 2 52 1 1. )l aizo fl M Patented June 17, 1941 UNITED STTE Frederick J. Knowles, Philadelphia, Pa., assignor to Nicholson File Company, Providence, R. I., a

corporation of Rhode Island Application June 29, 1939, Serial No. 281,991

5 Claims. (01. 76-33) The present application is a continuation-inpart of prior application Serial No. 243,636, filed December 2, 1938.

This invention relates to holders for use in holding the ends of a file in a saw filing machine. It has particular reference to holders for receiving and holding the ordinary three-cornered files generally used in such machines, although readily adapted to other forms of files.

The file holders heretofore generally usedin saw filing machines have not been satisfactory. As a rule, such holders consisted merely of two cylindrical sleeves bored longitudinally, the point of the file being tightly driven into one of the sleeves and the tang into the other and the sleeves then clamped in the machine, as shown for example in the patent to Foley, No. 1,224,293. In such prior arrangements, due to irregularities in the tangs of files as usually made, it has been found difficult to drive the ends of a file into the holding sleeves and get the file accurately positioned in the machine so that it would operate properly and not work loose and get out of alignment. Also, with such prior arrangements, every time the operator desired to change the. file to expose a new file surface to the work, it was necessary to loosen at least one clamping screw, rotate the file and set it in proper position by the use of a hand gauge, and then tighten the clamping screw again. Furthermore, to insert a new file in such arrangements, it wasnecessary to separately remove the sleeves from the machine, drive the endsof the new file intotthe sleeves, set the file by a hand gauge and tighten the clamping screws for holding the sleeves in position,

The present invention aims to provide an improved form of holder for the tangend of a'file (hereinafter termed the tang holder) and also an improved form of holder for theopposite end or point of the file (hereinafter termed the point holder). These improved holders areso constructed that they willpermanentlyandse curely hold a file in perfect alignment and in the exact position desired in the filing machine. They permit ready setting ofthe file at the proper angle in the machine and ready changing of the file to exposenew surfaces to-the work without the use of a gauge; They also permit quick removal of a worn fileand insertionofa new file without loss oftime and without thenceessity of using a hand gauge to position the file. The invention also contemplates a new arrangement of bracket which can be readily applied to or detached from a machine such as shown in the aforementioned patent and which is provided with aligned openings or sockets in which holders for the ends of the file may be firmly secured. The foregoing and other purposes and advantages of the invention will more fully ap pear from the following specification, taken in of Figure 7;

connection with the accompanying drawings, forming a part hereof, and in which:

Figure 1 illustrates the invention as applied to the type of machine shown in the aforesaid patent; I

Figure 2 is a horizontal section on line 2-2 of Figure 1, looking downwardly;

Figure 3 illustrates the invention applied to a form of support which may be attached to various forms of saw filing machines; Figure 4 is an enlarged longitudinal vertical section on the line 44 of Figure 5, showing particularly the detailed construction of the point holder in one form; I

Figure 5 is a transverse vertical section on the line 55 of Figure l;

Figures 6, 6A, and 7 are longitudinal sections showing slightly different forms of point holders;

Figure 8 is a vertical section on the line 8-8 section partly ineleof the; tang Figure 9 is a longitudinal vation, showing the construction holder;

Figure 10 is an end view thereof;

Figure 11 is a longitudinal elevation of a slightly different form of tang holder; and

Figure 12 is a view similar to Figure 1 showing a bracket adapted to beremovably applied to a machine such as shown in said Foley patent and having aligned openings-in which a point and tang holder may be securely clamped.

As already indicated, the tang holder and point holder of the present invention may be adapted to practically any saw filing machine of the kind now employed, with little or no modification thereof. Referring to the drawings in detail, and particularly to Figurel, the numeral Illindicates a reciprocating file supporting arm of the kind employed in the Foley patent previously mentioned. Mounted in the arm I0 arespaced sup- The members H and 12 are arranged in align by means of clamping bolts IA and 12A and are so spaced as to hold a file F between them.

The tang holder I6 is preferably made cylindrical in shape and the same is provided with a longitudinal bore [6A which is made of sufiicient size to receive the tang of a file. The end of the holder l6 which is intended to receive the tang of a file is provided with a socket I! which surrounds the end of the bore IEA. The socket I1 is made triangular in cross-section, and the side walls HA thereof are formed flat or substantially fiat so that they will surround and closely fit the fiat sides of a triangular file. The socket I1 is so made that it will receive the shoulder of a file, this term shoulder bein applied to that part of the file which is just beyond the tang and which has no teeth thereon. In the drawings, such shoulder is indicated at S. The fiat surfaces of the file shoulder are ground and accurately formed in the operation of making the file and the shoulder will therefore fit accurately into the socket H of the tang holder. It will be understood that different sizes of files will require tang holders having difierent sizes of sockets. In securing the tang holder IS in the machine, it must, of course, be set so that one side of the file will be held at the proper angle relative to the work. To facilitate initial setting of the tang holder in the proper position, the holder is provided With a pin l8 secured therein and this pin cooperates with a series of notches IS in the support I2. The pin and notches are accurately located in the holder 16 and support I2 respectively so that by placing the pin in one of the notches, the angle of the file relative to the work is automatically determined without the use of a hand gauge. Also, When the tang holder I6 is loosened to change the filing angle, the pin l8 prevents the holder from being forced rearwardly out of its support by the action of the spring pressed point holder, later described. In some cases it is desirable to provide the tang holder with an enlarged head ISB, as shown in Figure 11, particularly where it is desired to have a large socket in the holderr In the arrangement shown in Figure 3, the tang holder and point holder are mounted in a yoke 20, which is so shaped as to be readily applicable to various forms of filing machines. In this formof construction the tang holder l6 and point holder l are mounted directly in supporting members 20A and 20B which form part of the yoke 20, and which are provided with openings properly aligned to receive the same.

The point holder l 5, constituting part of the present invention, may be varied in structure as shown in the drawings. In general, the point holder comprises a cylindrical member or sleeve ISA and a plunger I5B slidably and rotatably mounted in the sleeve. The outer end of the plunger is provided with a triangular socket IBC substantially like the socket I! of the tang holder, but smaller; and this socket IE6 is adapted to receive and closely engage the three sides of a triangular file adjacent the point thereof. Various arrangements are shown in the drawings forretracting the plunger I5B of the point holder, that is, drawing it into the sleeve [5A. In Figure 4 a rod ISD extends longitudinally through .the sleeve I5A, the inner end thereof being threaded into the inner end of the plunger 15B. A coiled spring I5E surrounds the rod I5D and bears at one end against the plunger and. at the other end against a shoulder in the sleeve I5A. In the form shown in Figures 1 and 4, a button HE is secured to the outer end of the rod I5D for manually drawing the plunger inwardly against the action of the spring I5E.. The form shown in Figure 6 i substantially like that just described except that the outer end of the rod lED is bent to form a convenient handle or grip IEG for operating the rod and retracting the plunger. The button 15F or the handle 15G serves to limit outward movement of the plunger 1513 under the action of the spring ISE. In the form shown in Figures 3 and 7, the sleeve I5A is provided on each side with a longitudinal slot I5H, and a removable pin I51 extends through the slots and through a hole in the plunger 15B. By pressing against this pin the plunger can be retracted against the action of the spring I5E. In this form the pin I5I must be removed from the slot I5H before the plunger IEB can be rotated. in Figure 6A, a rod I5J is secured to the sleeve 15A and is provided with a head IEK to limit outward movement of the plunger 153.

In the use of the invention in the form above described, it will be understood that the tang holder and point holder are mounted in a filing machine and spaced apart the proper distance to receive a file between them. The tang holder is first set so that one side of the file will be arranged at the proper angle to the teeth of the saw upon which it'is intended to operateL' This initial setting may be obtained by engaging the pin IS on the tang holder with one of the notches IS in the support, or it may be obtained by using an ordinary hand gauge. The point holder requires no setting but is merely clamped in the supporting member and properly spaced from the tang holder. To insert a file, the tang and shoulder thereof are inserted in the tang holder, the plunger I513 of the point holder is retracted and the point of the file inserted there in. The plunger forces the file firmly into the tang holder and the file is securely held in the proper position during operation of the machine. When one surface of the file becomes Worn and it is desired to expose a new surface thereof to the work, it is only necessary to force the file toward the plunger [53 until the shoulder of the file is withdrawn from the socket l1 and then rotate it through an angle of 60 and permit the plunger to force the shoulder of the file back into the socket of the tang holder- The same operation is performed in bringing the next surface of the file into operative position. To insert a new file, the plunger of the point holder is retracted to free the point of the file and the old file can then be withdrawn and a new one inserted. The use of tools and the loosening and tightening of bolts are unnecessary in order to bring a new surface of a file into operation or in removing and inserting files. When the holders are once set they may remain indefinitely in the same position or as long as the same size of file is used.

The arrangement shown in Figure 12 provides a further means for adapting fileholders such as heretofore described to a machine of the kind illustrated in said Foley patent. This arrangement comprises a bracket 22 arranged beneath the supporting arm III of the file machine and provided with stems 23 which are adapted to project into the usual sockets IDA provided in the supporting arm [0 of the machine. Each stem 23 has a bolt 24 secured thereto on which a nut 25 is threaded and by which the portion of the stem in the socket may be adjusted.- A coiled spring 26 surrounds each bolt 24 and these springs form yielding abutments against upward movement of the stems 23 in their sockets. At its ends the bracket 22 is also provided with enlarged portions or supporting members 21 which are provided with aligned openings adapted to receive a point holder and a tang holder l6 such as heretofore described. The lugs 21 are split-longitudinally and the parts thereof may be'drawn together by bolts 28'to tightly clamp the file holders therein. In this arrangement, it will be seen that the bracket 22 with the file holders therein may be applied to or removed from the arm ID of the machine and this constitutes a convenient arrangement by which a machine such as shown in said Foley patent may be readily equipped with file holders of the kind heretofore described, and by means of brackets of different lengths and file holders of difierent sizes, such a machine can be made to readily receive files of any size desired.

Various changes in the details of the structure as above set forth may be made within the scope of the invention as set forth in the appended claims.

Having thus described the invention, what is claimed as new and desired to be secured by Letters Patent is:

1. In a saw filing machine, in combination, a reciprocating arm, two supporting members carried by said arm and secured thereto in spaced relation longitudinally of the arm, said supporting members having aligned openings therein, a holder for the tang end of the file mounted in one of said openings, means for clamping said tang holder in any desired position of adjustment longitudinally or circumferentially in said opening, said tang holder having a longitudinal bore therein for receiving the tang of a file and also having a socket in the end thereof surrounding the end of said bore for receiving the shoulder of a file above the tang, the side walls of said socket comprising a plurality of flat surfaces arranged to closely fit the fiat sides of the file shoulder when the tang of the file is inserted in said bore, said bore being of a diameter intermediate that of the tang and the shoulder portion of the file, whereby movement of said file into said holder is limited during either the positioning of the file or during the cutting stroke thereof, a holder for the point end of the file mounted in the other one of said openings, said point holder comprising a sleeve secured in said last named opening, a plunger slidably and rotatably mounted in said sleeve, said plunger having in its outer end a socket for receiving the point of a file and a spring in said sleeve bearing against said plunger to force the plunger and the file toward said tang holder.

2. In a saw filing machine, two spaced supporting members having aligned openings therein, a tang holder adjustably mounted in one of said openings, said tang holder having a longitudinal bore therein for receiving the tang of a file and also having a triangular socket surrounding the end of said bore for receiving the shoulder of a three-cornered file above the tan the three side walls of said socket comprising substantially fiat surfaces arranged to closely fit the three fiat sides of the file shoulder, when the tang of the file is inserted in said bore, said bore being of a diameter intermediate that of the tang and the shoulder portion of the file, whereby movement of said file into said holder is'limited during either the positioning of the file or during the cutting stroke thereof, a point holder for holding the point of a file with the tang thereof in said tang holder, said point holder being mounted in the other one of said openings and comprising a sleeve, a spring pressed plunger slidably and rotatably mounted in said sleeve for forcing the tang and shoulder of the file into said bore and socket respectively andup to their limit of movement, said plunger being yieldable for a distance suflicient to permit withdrawal of the shoulder of the file from said socket and rotation thereof while the tang re+ mains in said bore, whereby the file may be set to any position desired.

3. In a saw filing machine, a tang holder adjustably mounted in said machine, said tang holder having a longitudinal bore therein for receiving the tang of a file and also having a triangular socket surrounding the end of said bore for receiving the shoulder of a three-cornered file above the tang, the three side walls of said socket comprising substantially fiat surfaces arranged to closely fit the three flat sides of the file shoulder, when the tang of the file is inserted in said bore, said bore being of a diameter intermediate that of the tang and the shoulder portion of the file, whereby movement of said file into said holder is limited during either the positioning of the file or during the cutting stroke thereof, a point holder mounted in said machine and comprising a sleeve mounted in said 7 machine, a spring pressed plunger slidably and rotatably mounted in said sleeve in position to engage and hold the point of a file with the tang and shoulder thereof in said bore and socket respectively and up to their limit of movement, said plunger being yieldable for a distance sufiicient to permit withdraw-a1 of the shoulder of said file from said socket and rotation of the same without withdrawal of the tang of the file from said bore.

4. Means for securing a file in a saw filing machine of the type having a reciprocating arm provided with spaced sockets therein, said means comprising a bracket having spaced stems rigidly mounted thereon and adapted to be removably inserted in said sockets, said bracket also having spaced file supporting members formed thereon and provided with aligned openings, a holder having a longitudinal abutment for the tang end of a file secured in one of said openings, a holder for the point end of a file secured in the other of said openings, said point holder comprising a sleeve, a plunger slidably mounted in said sleeve, said plunger having in its outer end a socket for receiving the point of a file, a spring arranged in said sleeve and bearing against said plunger to force the plunger and the file toward said tang holder, said plunger being yieldable inwardly against said spring, whereby a file may be readily inserted in or removed from said holders.

5. In a saw filing machine, in combination, a reciprocating arm, two supporting members carried by said arm and secured thereto in spaced relation longitudinally of the arm, said supporting members having aligned openings therein, a holder for the tang end of thefile mounted in one of said openings, means for clamping said tang holder in any desired position of adjustment longitudinally or circumferentially in said opening, a pin projecting radially from said tang holder, and a series of spaced radial notches in one face of the supporting member for said tang holder, within which said pin may be selec-' shoulder when the tang of the file is inserted in said bore, said bore being of a diameter intermediate that of the tang and the shoulder portion of the file, whereby movement of said file into said holder is limited during either the positioning of the file or during the cutting stroke thereof, a holder for the point end of the file mounted in the other one of said openings, said point holder comprising a sleeve secured in said last named opening, a plunger slidably and rotatablymounted in said sleeve, said plunger having in its outerend a socket for receiving the point of a file and a spring in said sleeve bearing against said plunger to force the plunger and the file toward said tang holder.

- FREDERICK J. KNOWLES. 

